OSPF LSA type LSDB Link State Database DR Designated Router, responsible for flooding process on the multi-access network. Each router on the network forms an adjacency with Designated Router. Backup Designated Router(BDR), DR failure BDR can very quickly take responsibility and become DR. LSA – Link-state Advertisement, Each router generates …
What is IP? 1) high level: networks, applications and services 2) Internet Protocol, a network layer protocol enabling the routing of data across a packet network using specific address schemes TCP/IP 1) Internet Protocol Suite, a set of communication protocols for the Internet and similar networks 2) IP is part …
IPv6 called IPng(IP next generation) new version successor to IPv4 enhancement of IPv4 The shortage of IPv4 1) IPv4 address space is not enough IPv4 address, 32 bits, in theory can provide 4.3B, address allocation is not balance, US took half of space. 2) backbone router routing table is too …
For dev/test purpose, text mode is enough for openSUSE, just remote login from ssh session, so would be great to start openSUSE in text mode. 1) change default run level to 3 in /etc/inittab 2) have to re-create softlink for default.target manually # ll /etc/systemd/system/default.target /etc/systemd/system/default.target -> /lib/systemd/system/runlevel5.target # rm …
1) download ipython package from https://github.com/ipython/ipython/tree/0.13.x
1) download jython installer jar from http://www.jython.org/ 2) install jython in /usr/local in console mode without GUI /usr/local # java -jar jython-installer-2.5.3.jar –console Welcome to Jython ! You are about to install Jython version 2.5.3 (at any time, answer c to cancel the installation) For the installation process, the following …
1) download jdk download *.tar.gz from Oracle Java site, this version can be unpacked at local location, don’t need to uninstall current default jdk on system. jdk-7u-linux-i586.tar.gz JDK 7 jdk-7u-linux-x64.tar.gz JRE 7 64 bits 2) unzip jdk cd /usr/jdk/ gunzip *.tar.gz|tar xvf – /usr/jdk/jdk-1.7.0_21 // new jdk 7 3) remove …
1) download jdk 7 rpm from http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html dreamcloud-opensuse:/home/oldhorse/Downloads # cd /root/Downloads/ dreamcloud-opensuse:~/Downloads # ls .directory jdk-7u21-linux-x64.rpm 2) install jdk rpm using zypper dreamcloud-opensuse:~/Downloads # zypper in jdk-7u21-linux-x64.rpm -y Loading repository data… Reading installed packages… ‘-y’ not found in package names. Trying capabilities. No provider of ‘y’ found. Resolving package dependencies… …
The global setting change can be added to /etc/profile, this will be refreshed on next user login; or /etc/bash.bashrc(openSUSE) or /etc/bash/bashrc, this will be refreshed on next bash shell started. I prefer use bash profile. openSUSE setup add change at end of /etc/bash.bashrc Solaris 11 x86 add change at end …
Not too surprise seems hgfs never worked on new released opensuse, same story for opensese 12.1 latest stable version. hgfs error linux-sr1k:/etc/udev/rules.d # modprobe vmhgfs FATAL: Error inserting vmhgfs (/lib/modules/3.1.0-1.2-desktop/weak-updates/updates/vmhgfs.ko): Invalid argument linux-sr1k:/etc/udev/rules.d # dmesg |grep -i hgfs [ 4469.514470] vmhgfs: no symbol version for VMCIDatagram_Send [ 4469.514918] vmhgfs: Unknown …